Yeah, I just went out and looked at mine. I have the manual size, and the short piece is 17" and the long, 19".
When the handle is in, they are locked.
Remove the handle, and they slide apart. The long piece is(was) marked on and off to which way to put it together whether you are installing or removing the panel.
I gave some bad info at the beginning when I saw the pieces separated, as mine have been together for years, unused.
Seeing the two different length pieces, which were actually one tool, I was reminded that they do sell a longer one for auto screeens.